我不明白为什么辅助服务器上的存储大小比主服务器上的大得多（450 GB 对 375 GB）。
- 硬件、操作系统、文件系统和 mongodb 配置在主要和次要上是相同的
- 存储引擎是有线老虎
- 每天都会创建一个新数据库，其中存储当天的历史数据
- 保留最后 14 天（数据库）
- 最旧的数据库在一天之后被删除
- 文档永远不会更新或删除，它们只会被插入和读取
- 过去没有初级/次级开关
正如您在集合统计中看到的那样，主要count和avgObjectSize次要之间是相同的，但storageSize有所不同。为什么会这样？可以修复（如何）？
offerHistory02:SECONDARY> db.offerHistory.stats()
{
"ns" : "log-2021-03-27.offerHistory",
"size" : NumberLong("1147404775489"),
"count" : 1293199443,
"avgObjSize" : 887,
"storageSize" : 483053527040,
"capped" : false,
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1
},
"creationString" : "access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1),assert=(commit_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=snappy,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=64MB,log=(enabled=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_image_max=0,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u",
"type" : "file",
"uri" : "statistics:table:collection-2583--5720839012155665746",
"LSM" : {
"bloom filter false positives" : 0,
"bloom filter hits" : 0,
"bloom filter misses" : 0,
"bloom filter pages evicted from cache" : 0,
"bloom filter pages read into cache" : 0,
"bloom filters in the LSM tree" : 0,
"chunks in the LSM tree" : 0,
"highest merge generation in the LSM tree" : 0,
"queries that could have benefited from a Bloom filter that did not exist" : 0,
"sleep for LSM checkpoint throttle" : 0,
"sleep for LSM merge throttle" : 0,
"total size of bloom filters" : 0
},
"block-manager" : {
"allocations requiring file extension" : 72040317,
"blocks allocated" : 72069969,
"blocks freed" : 32831,
"checkpoint size" : 483052630016,
"file allocation unit size" : 4096,
"file bytes available for reuse" : 880640,
"file magic number" : 120897,
"file major version number" : 1,
"file size in bytes" : 483053527040,
"minor version number" : 0
},
"btree" : {
"btree checkpoint generation" : 322002,
"column-store fixed-size leaf pages" : 0,
"column-store internal pages" : 0,
"column-store variable-size RLE encoded values" : 0,
"column-store variable-size deleted values" : 0,
"column-store variable-size leaf pages" : 0,
"fixed-record size" : 0,
"maximum internal page key size" : 368,
"maximum internal page size" : 4096,
"maximum leaf page key size" : 2867,
"maximum leaf page size" : 32768,
"maximum leaf page value size" : 67108864,
"maximum tree depth" : 5,
"number of key/value pairs" : 0,
"overflow pages" : 0,
"pages rewritten by compaction" : 0,
"row-store internal pages" : 0,
"row-store leaf pages" : 0
},
"cache" : {
"bytes currently in the cache" : 427430184,
"bytes read into cache" : 1750413,
"bytes written from cache" : NumberLong("1163389289271"),
"checkpoint blocked page eviction" : 11018,
"data source pages selected for eviction unable to be evicted" : 924534,
"eviction walk passes of a file" : 10012883,
"eviction walk target pages histogram - 0-9" : 2069657,
"eviction walk target pages histogram - 10-31" : 886769,
"eviction walk target pages histogram - 128 and higher" : 0,
"eviction walk target pages histogram - 32-63" : 433587,
"eviction walk target pages histogram - 64-128" : 6622870,
"eviction walks abandoned" : 44203,
"eviction walks gave up because they restarted their walk twice" : 1968,
"eviction walks gave up because they saw too many pages and found no candidates" : 1804734,
"eviction walks gave up because they saw too many pages and found too few candidates" : 14522,
"eviction walks reached end of tree" : 1818021,
"eviction walks started from root of tree" : 1866522,
"eviction walks started from saved location in tree" : 8146361,
"hazard pointer blocked page eviction" : 73210,
"in-memory page passed criteria to be split" : 923037,
"in-memory page splits" : 147932,
"internal pages evicted" : 531175,
"internal pages split during eviction" : 5277,
"leaf pages split during eviction" : 170222,
"modified pages evicted" : 184054588,
"overflow pages read into cache" : 0,
"page split during eviction deepened the tree" : 2,
"page written requiring cache overflow records" : 0,
"pages read into cache" : 137,
"pages read into cache after truncate" : 1,
"pages read into cache after truncate in prepare state" : 0,
"pages read into cache requiring cache overflow entries" : 0,
"pages requested from the cache" : 3732724262,
"pages seen by eviction walk" : 992177213,
"pages written from cache" : 72067093,
"pages written requiring in-memory restoration" : 142958112,
"tracked dirty bytes in the cache" : 0,
"unmodified pages evicted" : 60247131
},
"cache_walk" : {
"Average difference between current eviction generation when the page was last considered" : 0,
"Average on-disk page image size seen" : 0,
"Average time in cache for pages that have been visited by the eviction server" : 0,
"Average time in cache for pages that have not been visited by the eviction server" : 0,
"Clean pages currently in cache" : 0,
"Current eviction generation" : 0,
"Dirty pages currently in cache" : 0,
"Entries in the root page" : 0,
"Internal pages currently in cache" : 0,
"Leaf pages currently in cache" : 0,
"Maximum difference between current eviction generation when the page was last considered" : 0,
"Maximum page size seen" : 0,
"Minimum on-disk page image size seen" : 0,
"Number of pages never visited by eviction server" : 0,
"On-disk page image sizes smaller than a single allocation unit" : 0,
"Pages created in memory and never written" : 0,
"Pages currently queued for eviction" : 0,
"Pages that could not be queued for eviction" : 0,
"Refs skipped during cache traversal" : 0,
"Size of the root page" : 0,
"Total number of pages currently in cache" : 0
},
"compression" : {
"compressed pages read" : 63,
"compressed pages written" : 61677121,
"page written failed to compress" : 32009,
"page written was too small to compress" : 10311695,
"raw compression call failed, additional data available" : 0,
"raw compression call failed, no additional data available" : 0,
"raw compression call succeeded" : 0
},
"cursor" : {
"bulk-loaded cursor-insert calls" : 0,
"close calls that result in cache" : 0,
"create calls" : 61,
"cursor operation restarted" : 176248823,
"cursor-insert key and value bytes inserted" : 1087461754174,
"cursor-remove key bytes removed" : 0,
"cursor-update value bytes updated" : 0,
"cursors reused from cache" : 211664692,
"insert calls" : 1220619643,
"modify calls" : 0,
"next calls" : 397,
"open cursor count" : 0,
"prev calls" : 1,
"remove calls" : 0,
"reserve calls" : 0,
"reset calls" : 539520296,
"search calls" : 76,
"search near calls" : 0,
"truncate calls" : 0,
"update calls" : 0
},
"reconciliation" : {
"dictionary matches" : 0,
"fast-path pages deleted" : 0,
"internal page key bytes discarded using suffix compression" : 60661951,
"internal page multi-block writes" : 28312,
"internal-page overflow keys" : 0,
"leaf page key bytes discarded using prefix compression" : 0,
"leaf page multi-block writes" : 150396,
"leaf-page overflow keys" : 0,
"maximum blocks required for a page" : 1,
"overflow values written" : 0,
"page checksum matches" : 90452,
"page reconciliation calls" : 226401610,
"page reconciliation calls for eviction" : 176333404,
"pages deleted" : 41475470
},
"session" : {
"object compaction" : 0
},
"transaction" : {
"update conflicts" : 0
}
},
"nindexes" : 2,
"totalIndexSize" : 59087273984,
"indexSizes" : {
"_id_" : 34540539904,
"offerId_1" : 24546734080
},
"ok" : 1,
"operationTime" : Timestamp(1617146426, 6416),
"$gleStats" : {
"lastOpTime" : Timestamp(0, 0),
"electionId" : ObjectId("7fffffff000000000000000b")
},
"$configServerState" : {
"opTime" : {
"ts" : Timestamp(1617146426, 4484),
"t" : NumberLong(23)
}
},
"$clusterTime" : {
"clusterTime" : Timestamp(1617146426, 6443),
"signature" : {
"hash" : BinData(0,"o3Sx+m0MnfXkEQkfdUHHJWnlRl8="),
"keyId" : NumberLong("6899518352868248974")
}
}
}
相对：
offerHistory02:PRIMARY> db.offerHistory.stats()
{
"ns" : "log-2021-03-27.offerHistory",
"size" : NumberLong("1147404775489"),
"count" : 1293199443,
"avgObjSize" : 887,
"storageSize" : 403410546688,
"capped" : false,
"wiredTiger" : {
"metadata" : {
"formatVersion" : 1
},
"creationString" : "access_pattern_hint=none,allocation_size=4KB,app_metadata=(formatVersion=1),assert=(commit_timestamp=none,read_timestamp=none),block_allocation=best,block_compressor=snappy,cache_resident=false,checksum=on,colgroups=,collator=,columns=,dictionary=0,encryption=(keyid=,name=),exclusive=false,extractor=,format=btree,huffman_key=,huffman_value=,ignore_in_memory_cache_size=false,immutable=false,internal_item_max=0,internal_key_max=0,internal_key_truncate=true,internal_page_max=4KB,key_format=q,key_gap=10,leaf_item_max=0,leaf_key_max=0,leaf_page_max=32KB,leaf_value_max=64MB,log=(enabled=true),lsm=(auto_throttle=true,bloom=true,bloom_bit_count=16,bloom_config=,bloom_hash_count=8,bloom_oldest=false,chunk_count_limit=0,chunk_max=5GB,chunk_size=10MB,merge_custom=(prefix=,start_generation=0,suffix=),merge_max=15,merge_min=0),memory_page_image_max=0,memory_page_max=10m,os_cache_dirty_max=0,os_cache_max=0,prefix_compression=false,prefix_compression_min=4,source=,split_deepen_min_child=0,split_deepen_per_child=0,split_pct=90,type=file,value_format=u",
"type" : "file",
"uri" : "statistics:table:collection-2583--1868846566931849507",
"LSM" : {
"bloom filter false positives" : 0,
"bloom filter hits" : 0,
"bloom filter misses" : 0,
"bloom filter pages evicted from cache" : 0,
"bloom filter pages read into cache" : 0,
"bloom filters in the LSM tree" : 0,
"chunks in the LSM tree" : 0,
"highest merge generation in the LSM tree" : 0,
"queries that could have benefited from a Bloom filter that did not exist" : 0,
"sleep for LSM checkpoint throttle" : 0,
"sleep for LSM merge throttle" : 0,
"total size of bloom filters" : 0
},
"block-manager" : {
"allocations requiring file extension" : 47004346,
"blocks allocated" : 47029067,
"blocks freed" : 32112,
"checkpoint size" : 403410251776,
"file allocation unit size" : 4096,
"file bytes available for reuse" : 278528,
"file magic number" : 120897,
"file major version number" : 1,
"file size in bytes" : 403410546688,
"minor version number" : 0
},
"btree" : {
"btree checkpoint generation" : 329809,
"column-store fixed-size leaf pages" : 0,
"column-store internal pages" : 0,
"column-store variable-size RLE encoded values" : 0,
"column-store variable-size deleted values" : 0,
"column-store variable-size leaf pages" : 0,
"fixed-record size" : 0,
"maximum internal page key size" : 368,
"maximum internal page size" : 4096,
"maximum leaf page key size" : 2867,
"maximum leaf page size" : 32768,
"maximum leaf page value size" : 67108864,
"maximum tree depth" : 5,
"number of key/value pairs" : 0,
"overflow pages" : 0,
"pages rewritten by compaction" : 0,
"row-store internal pages" : 0,
"row-store leaf pages" : 0
},
"cache" : {
"bytes currently in the cache" : 519160231,
"bytes read into cache" : 108549491,
"bytes written from cache" : NumberLong("1161908962381"),
"checkpoint blocked page eviction" : 4910,
"data source pages selected for eviction unable to be evicted" : 241550,
"eviction walk passes of a file" : 5058704,
"eviction walk target pages histogram - 0-9" : 1441924,
"eviction walk target pages histogram - 10-31" : 706198,
"eviction walk target pages histogram - 128 and higher" : 0,
"eviction walk target pages histogram - 32-63" : 324631,
"eviction walk target pages histogram - 64-128" : 2585951,
"eviction walks abandoned" : 62344,
"eviction walks gave up because they restarted their walk twice" : 0,
"eviction walks gave up because they saw too many pages and found no candidates" : 1249672,
"eviction walks gave up because they saw too many pages and found too few candidates" : 23472,
"eviction walks reached end of tree" : 1139902,
"eviction walks started from root of tree" : 1335874,
"eviction walks started from saved location in tree" : 3722830,
"hazard pointer blocked page eviction" : 9346,
"in-memory page passed criteria to be split" : 551341,
"in-memory page splits" : 148613,
"internal pages evicted" : 247462,
"internal pages split during eviction" : 2425,
"leaf pages split during eviction" : 167334,
"modified pages evicted" : 57437477,
"overflow pages read into cache" : 0,
"page split during eviction deepened the tree" : 2,
"page written requiring cache overflow records" : 0,
"pages read into cache" : 8699,
"pages read into cache after truncate" : 1,
"pages read into cache after truncate in prepare state" : 0,
"pages read into cache requiring cache overflow entries" : 0,
"pages requested from the cache" : 3808973750,
"pages seen by eviction walk" : 569860253,
"pages written from cache" : 47026827,
"pages written requiring in-memory restoration" : 50006230,
"tracked dirty bytes in the cache" : 0,
"unmodified pages evicted" : 39345995
},
"cache_walk" : {
"Average difference between current eviction generation when the page was last considered" : 0,
"Average on-disk page image size seen" : 0,
"Average time in cache for pages that have been visited by the eviction server" : 0,
"Average time in cache for pages that have not been visited by the eviction server" : 0,
"Clean pages currently in cache" : 0,
"Current eviction generation" : 0,
"Dirty pages currently in cache" : 0,
"Entries in the root page" : 0,
"Internal pages currently in cache" : 0,
"Leaf pages currently in cache" : 0,
"Maximum difference between current eviction generation when the page was last considered" : 0,
"Maximum page size seen" : 0,
"Minimum on-disk page image size seen" : 0,
"Number of pages never visited by eviction server" : 0,
"On-disk page image sizes smaller than a single allocation unit" : 0,
"Pages created in memory and never written" : 0,
"Pages currently queued for eviction" : 0,
"Pages that could not be queued for eviction" : 0,
"Refs skipped during cache traversal" : 0,
"Size of the root page" : 0,
"Total number of pages currently in cache" : 0
},
"compression" : {
"compressed pages read" : 3402,
"compressed pages written" : 44862562,
"page written failed to compress" : 3760,
"page written was too small to compress" : 2135269,
"raw compression call failed, additional data available" : 0,
"raw compression call failed, no additional data available" : 0,
"raw compression call succeeded" : 0
},
"cursor" : {
"bulk-loaded cursor-insert calls" : 0,
"close calls that result in cache" : 0,
"create calls" : 376,
"cursor operation restarted" : 8863521,
"cursor-insert key and value bytes inserted" : NumberLong("1151926070153"),
"cursor-remove key bytes removed" : 0,
"cursor-update value bytes updated" : 0,
"cursors reused from cache" : 133353675,
"insert calls" : 1291054491,
"modify calls" : 0,
"next calls" : 1,
"open cursor count" : 17699,
"prev calls" : 1,
"remove calls" : 0,
"reserve calls" : 0,
"reset calls" : 266569743,
"search calls" : 4385,
"search near calls" : 0,
"truncate calls" : 0,
"update calls" : 0
},
"reconciliation" : {
"dictionary matches" : 0,
"fast-path pages deleted" : 0,
"internal page key bytes discarded using suffix compression" : 79075940,
"internal page multi-block writes" : 25191,
"internal-page overflow keys" : 0,
"leaf page key bytes discarded using prefix compression" : 0,
"leaf page multi-block writes" : 151115,
"leaf-page overflow keys" : 0,
"maximum blocks required for a page" : 1,
"overflow values written" : 0,
"page checksum matches" : 182737,
"page reconciliation calls" : 64953107,
"page reconciliation calls for eviction" : 56370626,
"pages deleted" : 7290000
},
"session" : {
"object compaction" : 0
},
"transaction" : {
"update conflicts" : 0
}
},
"nindexes" : 2,
"totalIndexSize" : 57366028288,
"indexSizes" : {
"_id_" : 33265238016,
"offerId_1" : 24100790272
},
"ok" : 1,
"operationTime" : Timestamp(1617146426, 6443),
"$gleStats" : {
"lastOpTime" : Timestamp(0, 0),
"electionId" : ObjectId("7fffffff000000000000000c")
},
"$configServerState" : {
"opTime" : {
"ts" : Timestamp(1617146426, 4501),
"t" : NumberLong(23)
}
},
"$clusterTime" : {
"clusterTime" : Timestamp(1617146426, 6443),
"signature" : {
"hash" : BinData(0,"o3Sx+m0MnfXkEQkfdUHHJWnlRl8="),
"keyId" : NumberLong("6899518352868248974")
}
}
}